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DCR010505: DCR010505U,上电,冲击电流过大,直接拉满到限流,5V电源掉到3V ,怎么回事???

Part Number: DCR010505

电路按手册典型电路搭建,使用直流源供电(5V,1A),上电后,5V电源变成3V,1A电流,过几秒,电源变为5V,0.3A(正常电流)。拆掉此片子,故障不复现。使用测试板搭建相同电路,故障不复现。什么原因??????????????